Class: StudentsList

Inherits:
Object
  • Object
show all
Defined in:
lib/source/models/student_list/student_list.rb

Instance Method Summary collapse

Constructor Details

#initialize(dt) ⇒ StudentsList

Returns a new instance of StudentsList.



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# File 'lib/source/models/student_list/student_list.rb', line 6

def initialize(dt)
  self.students = []
  self.transformer = dt
end

Instance Method Details

#add_student(student) ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 41

def add_student(student)
  maxID = students.max_by(&:id)
  student.id = maxID != nil ? maxID.id + 1 : 0
  students << student
end

#get_k_n_student_short_list(page, count, existing_data_list: nil) ⇒ Object

Получить page по счету count элементов (страница начинается с 1)



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# File 'lib/source/models/student_list/student_list.rb', line 61

def get_k_n_student_short_list(page, count, existing_data_list: nil)
  offset = (page - 1) * count
  slice = students[offset, count].map { |s| StudentShort.from_student(s) }
  
  return DataListStudentShort.new(list: slice) if existing_data_list.nil?
  
  existing_data_list.append(slice)
end

#get_student_short_count ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 56

def get_student_short_count
  students.count
end

#read_from_txt(file_path) ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 11

def read_from_txt(file_path)
    begin
        File.foreach(file_path) do |line|
          students << transformer.parse_to_student(line)
        end
    rescue => exception
        raise "File not found at the given address #{file_path}. Exception: #{exception.message}"
    end
end

#remove(student_id) ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 52

def remove(student_id)
  students.reject! { |s| s.id == student_id }
end

#replace(student_id, student) ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 47

def replace(student_id, student)
  idx = student.find_index { |s| s.id == student_id }
  students[idx] = student
end

#sorted ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 37

def sorted
    students.sort_by(&:fio)
end

#student_by_id(student_id) ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 33

def student_by_id(student_id)
  students.detect { |s| s.id == student_id }
end

#write_to_txt(file_path) ⇒ Object 



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# File 'lib/source/models/student_list/student_list.rb', line 21

def write_to_txt(file_path)
    begin
        File.open(file_path, 'w') do |file|
        students.each do |student|
          file.puts transformer.puts_student(student)
        end
        end
    rescue => exception
        raise "Error writing to file at the given address #{file_path}. Exception: #{exception.message}"
    end
end